Pump



Jan. 3, 1933. J. R. MUIRHEAD ETAL 14,893,433

PUMP

Crginal Filedv Nov. 20, 1928 INVENTORS I0/LB@ nf. mais ATTOH NEYSPatented Jan. 3, 1933 UNITED STATES frATiiNifl",

JOHN ROBE MUImInAn, or KIaKcALDY, SOUTH AUSTRALIA, AND Joriiv WILLIAMMILLS, or ADELAIDE, SOUTH AUSTRALIA, AUSTRALIA PUMP Original applicationiiled November 20, 1928, Serial No. 320,616, and in Australia November26, ,1927.

Divided and this application filed Augustl 8, 1930. Serial 110.474,004.

The application is a divisional application of our application SerialNumber 320,616 filed th November, 1928 patented November 25, 1930,Patent Number 1,783,095.

This invention comprises a device for removing water, air or other'fluid from av receptacle. In particular it has been devised forremoving water or other liquid from a boat or the like, being applicableto boats propelled by any means, but its uses are in no way limited tothat particular purpose.

Our device comprises as its essential features a tube having at ortowards its one end a cylinder carrying within it an Archimedian orhelical screw or a series of inclined blades projecting from a shortshaft the one end of which projects beyond the end of the cylinder andcarries a propeller Screw or other means whereby it is driven, and thecylinder having within or upon its one end a camshaped face or groove,and the shaft having upon it a projecting finger which engages andtravels around such face or Vgroove and causes the Shaft and the helicalScrew to make an endwise movement as Athey rotate. Preferably the tubehas at or near its inlet end an inlet valve.

In order that our invention may be the more clearly understood we willdescribe the same with reference to the accompanying drawing which ismore Or less diagrammatic and in which Fig. 1 is a plan view of ourinvention showing the helical screw pump upon the outlet end of thetube.

Fig. 2 is a sectional view of the helical screw pump to a larger scale.

Fig. 3 shows a modification of the construction shown in Figs. 1 and 2wherein a handwheel is substituted for the propeller upon the end of theshaft.

In the drawing 1 represents a length of tube having near its inlet endan inlet valve 2, which may be a conventional type of foot valvecommonly used in pumps and having upon its outlet end a cylinder 8carrying within it an Archimedian or helical screw 9 or a series ofinclined blades projecting from a short shaft 10 carried in bearingswithin the cylinder and the end of which projects beyondtheend of thecylinder and hasvupon i it a propeller screw 11 which extends beyond thecircumference of the cylinder. Vithin the end of the cylinder 8 is aliner 12 having a cam-shaped face or end, andrupon the s haft 10 isafprojecting finger 13 which Vtravels around such face and causes theshaft the helical Screw and the propeller to make an endwise-movement asthey rotate. A spiral spring 14 holds the finger 13 in contact with thecamface. The cam-faced liner maybe removed andreversed if desired, thecam on the one end being of greater inclination than that upon theother, or the cam face may be formed upon the end of the cylinder. Theend of lthe tube1with the cylinder 8 may be simply hung over the side ofthe boat and trail in the water, or it may be attached to the rudder orto ahanger frame and serve in place of the rudder, or the cylinder maybe attached by va bracket to the bottom of the.

boat, in which case the inlet end of the tube may pass through thebottom of the boat. In any case, as the boat moves through the water thepropeller or vanes are thereby caused to rotate and so rotate thehelical screw or inclined blades and so draw thewater from the boat.

It has been found that the flow of water through a pump constructedaccording to Our invention is greatly increased over a screwtype pump ofthe same size in which no reciprocating movement is given to a helicalscrew impeller. Our pump can be operated at a much slower speed than apump with a nonreciprocating helical blade and still produce an equal orgreater flow of liquid therethrough.

According to a modification of the foregoing the propeller 11incidentally .shown may be removed from the shaft and a hand Wheel orother operative device may be substituted therefor. In this case thecylinder will not be submerged in the water, but may be held upon thegunwale of a'boat or it may lie on the bottom and be driven by aflexible shafting in the delivery pipe worked by the propeller orotherwise, or the pump may be used in other desired positions.

1. A pump comprising a cylinder, an inlet valve for one end thereof, arotatable and reciprocable shaft mountedconcentrically within saidcylinder, a helical blade carried by and encircling a portion of saidshaft within said cylinder, avliner secured within said cylinder havinga t cam face t formed therewith, a finger carried by said shaft andengaging said cam face, and means for rotating said shaft whereby saidshaft and screw will i have a reciprocating motion imparted thereto uponrotation thereof due to said finger travelling over said cam face.

2. In a device of the character described, a i

pump cylinder, an inlet tube communicating with one end thereof, aninlet valve carried by said tube, a rotatable and reciprocable shaftmounted concentrically within said cylinder, a helical blade carried byand encircling a portion of said shaft within said cylinder, means forrotating said shaft, a cam secured within said cylinder and providing acam face and a finger carried by said shaft for engagement with said camface, a spring normally urging said shaft in a direction to maintainsaid finger in engagement with said cam whereby to impart reciprocatingmotion to said shaft and helical blade upon rotation thereof.

In testimony that we claim the foregoing as our invention we have signedour names this 5 day of July, 1930.

JOHN ROBB MUIRHEAD. JOHN WILLIAM MILLS.

